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Stencil vs Szyszka: catalog facts
Stencil	Szyszka
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the MIT licence.
macOS, Linux	Windows, macOS, Linux
Native apps for both GNOME and macOS Combinable list of rename operations	Multiple renaming rules that can be combined Fast with large numbers of files
No Windows version Small project with a single main developer	Development is infrequent GTK interface feels out of place outside Linux
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.